Command usage cleanup

Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/board/sandburst/karef/karef.c b/board/sandburst/karef/karef.c
index 8d97a9c..9b94af5 100644
--- a/board/sandburst/karef/karef.c
+++ b/board/sandburst/karef/karef.c
@@ -578,7 +578,7 @@
 }
 
 U_BOOT_CMD(kasetup, 1, 1, karefSetupVars,
-	   "kasetup - Set environment to factory defaults\n", NULL);
+	   "Set environment to factory defaults", NULL);
 
 U_BOOT_CMD(karecover, 1, 1, karefRecover,
-	   "karecover - Set environment to allow for fs recovery\n", NULL);
+	   "Set environment to allow for fs recovery", NULL);